Bit for drilling cast iron

Details Bit for drilling cast iron Bit for drilling cast iron

1990-08-27

1991-11-19

Howell, Daniel W.

Metal tools and implements, making

Blank or process

Drill

408144, 408145, 408230, B23B 5102, B23P 1532

Patent

active

050656473

ABSTRACT:
Method of making and tool bit construction; the bit has a diametrical blade implant of a two-phase material: a main phase of cemented carbine with diffusion bonded cubic boron nitride insert phases placed at high stress corners of such blade, limited strictly to the radial cutting zone of the bit without penetrating the centering zone.

REFERENCES:
patent: 4583888 (1986-04-01), Mori et al.
patent: 4679971 (1987-07-01), Maier
patent: 4728231 (1988-03-01), Kunimori et al.
patent: 4762445 (1988-08-01), Bunting et al.

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